#include <57header.h>

void a(){

    return ;
}
void *func(void *p){

    a();
    printf("son thread \n");

    return NULL;
}
int main(int argc,char*argv[])
{

    pthread_t son_id;
    pthread_create(&son_id, NULL, func, NULL);


    pthread_join(son_id, NULL);
    return 0;
}

